Melissa McCarthy's weight loss has people talking (PHOTOS)

Much is being made of Melissa McCarthy's appearance on Jimmy Kimmel Live! last night, and not just because she won the audience over with her trademark charm.

McCarthy — who has been making the rounds promoting her new comedy, Boss — is garnering major attention for her weight loss as of late.

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Arriving on set last night in a black turtleneck sweater, skinny jeans and a fringed sweater from her own Melissa McCarthy Seven7 Collection, the 45-year-old actress looked noticeably slimmer. Some sources claim she has recently shed 50-plus pounds by adhering to a high protein, low-carb diet. It's a shift that has not gone unnoticed.

According to Celebrity Health and Fitness magazine, in fact, McCarthy has been following the same diet Tim McGraw and Megan Fox have used to drop pounds. The magazine says McCarthy can also credit her weight loss to a regimen of Pilates and walking. It's a shift that has not gone unnoticed by fans.

But while it would seem like McCarthy doing something to benefit her health and overall peace of mind would be well-received, not everyone is applauding the Boss star's slim down. Some detractors think McCarthy hasn't done enough to merit the positive attention.

However, a certain ratio of "keyboard warriors" are sadly to be expected — there will always be those who choose to troll celebrities, and they certainly aren't what you might call fans. In that respect, these criticisms (as rude as they may be) are not the most shocking feedback McCarthy's weight loss is eliciting.

Apparently, some fans are upset because they feel as though McCarthy has abandoned her role as an advocate for body positivity. These fans are citing previous statements made by McCarthy in which she said she would always be happy with herself and wasn't worried about losing weight.

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The logic, one can assume, is that they feel slighted by McCarthy in some way and worry that her dramatic weight loss is sending the wrong message to those who would embrace body positivity — that in order to be truly happy with your body, you must slim down.

And even in slimming down, McCarthy has remained a passionate spokesperson for the plus-size community — even launching an entire fashion line around size inclusivity. "People don't stop at size 12. I feel like there's a big thing missing where you can't dress to your mood above a certain number," she told More magazine in May. "[Malls] segregate plus-size [women]. It's an odd thing that you can't go shopping with your friends because your store is upstairs hidden by the tire section. We'll put you gals over there because we don't want to see you and you probably don't want to be seen."

Perhaps this fan says it best, reminding everyone that McCarthy is the sum of more than just her size.